iFixit Posts Repair Manuals for the Retina Display MacBook Pro
iFixit has posted a full set of repair guides for the 2012 Retina Display MacBook Pro.
The site warns that working on the laptop is not an easy task calling it "the least repairable laptop we've taken apart." However, using the correct tools some components can be removed without much fuss.
Although many components can be replaced with screwdrivers and elbow grease, some repairs are simply infeasible. For example, there is almost no way to replace the trackpad without first removing the battery. While it's possible to remove the battery, chances are high that it will be punctured in the process (the score? Batteries: 2, iFixit: 0). Puncturing Lithium-polymer batteries releases noxious fumes and can cause fires. Likewise, removing the LCD glass from the aluminum frame will almost certainly break the glass. So components residing under the LCD - such as the FaceTime camera - will have to be replaced with the entire assembly.
It's estimated that third party battery replacement will cost over $500 if you follow Apple's procedure and replace the entire upper case with the battery.
Check out the repair guides at the link below...